GWT HTTP errror 503, SERVICE UNAVAILABLE

I am new to GWT, Spring and Hibernate. When I run sample code in GWT, Spring and Hibernate with oracle database, following error pops up.

HTTP ERROR: 503

Problem accessing /ECMSoftware.html. Reason:

Service Unavailable

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The html ( ECMSoftweare.html ) is created under /war/ECMSoftware.html.

Is there any hints to solve the issue ?

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